Can I just say that on a whole, I had a much easier time in Aquila on my Witchdoctor when I switched all my front rows of companions to Musketeers and spread out a bit? Your mileage may vary (YMMV) of course.

I'd love to hear some player suggestions for Lily!

I am posting this here too to make sure Lilly catches my response to her.
Yea I learned my lesson quick that my former heavy hitter swashbucklers are getting slaughtered in Aquila. On the sky snakes they took out my Wagu Bull Samoorai in the first round, before I could even shield him. I learned from here to use musketeers and witchdoctor companions and to position yourself well if they have flanking. Just by paying attention to what they can do and making sure you don't offer them any easy hits, can make all the difference. If you have one you really must use then try getting Valor's armor for your Witchdoctor. My musketeer actually has to of them now and she saves her crew all the time with them, plus saving friends too. Once you can protect a heavy hitter, like my necromancer pig, they can do the good damage and still be alive to keep it up.